linux-kernel - [PATCH v2 0/2] Fix subsection vmemmap

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Message-ID: <20241209094227.1529977-1-quic_zhenhuah@quicinc.com>
Date: Mon, 9 Dec 2024 17:42:25 +0800
From: Zhenhua Huang <quic_zhenhuah@...cinc.com>
To: <catalin.marinas@....com>, <will@...nel.org>, <ardb@...nel.org>,
        <ryan.roberts@....com>, <mark.rutland@....com>, <joey.gouly@....com>,
        <dave.hansen@...ux.intel.com>, <akpm@...ux-foundation.org>,
        <chenfeiyang@...ngson.cn>, <chenhuacai@...nel.org>
CC: <linux-mm@...ck.org>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Zhenhua Huang <quic_zhenhuah@...cinc.com>
Subject: [PATCH v2 0/2] Fix subsection vmemmap_populate logic

To perform memory hotplug operations, the memmap (aka struct page) will be
updated. For arm64 with 4K page size, the typical granularity is 128M,
which corresponds to a 2M memmap buffer.
Commit c1cc1552616d ("arm64: MMU initialisation")
optimizes this 2M buffer to be mapped with one single PMD entry. However,
commit ba72b4c8cf60 ("mm/sparsemem: support sub-section hotplug")
which supports 2M subsection hotplug granularity, causes other issues
(refer to the change log of patch #1). The logic is adjusted to populate
with huge pages only if the hotplug address/size is section-aligned.

Changes since v1:
  - Modified change log to make it more clear which was based on Catalin's
    comments.

Zhenhua Huang (2):
  arm64: mm: vmemmap populate to page level if not section aligned
  arm64: mm: implement vmemmap_check_pmd for arm64

 arch/arm64/mm/mmu.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

-- 
2.25.1